Overview
The ZF 4657.056.051 6 WG 210 Powershift Transmission Assembly is a complete, factory-grade unit engineered for heavy-duty off-highway machinery. This assembly serves as the central power transfer module within the WG 210 series, converting engine torque into controlled, multi-speed output for wheel loaders, dozers, and graders. As a fully assembled unit, SKU 4657.056.051 integrates the main gear cluster, clutch packs, and hydraulic valve body into a single drop-in replacement. It mounts directly between the torque converter and the final drive, with the TRANSMISSION HOUSING providing structural rigidity and oil containment. This complete unit eliminates the need for partial rebuilds, offering a direct solution for severe wear or catastrophic internal failure.
Symptoms of Failure
- Erratic gear engagement or slipping under load: Worn clutch discs or damaged seals inside the 4657.056.051 cause delayed shifts or power loss, especially when the machine is under heavy strain.
- Persistent transmission oil leaks at the housing seam: Cracks or warping in the HOUS.FRONT SECT or rear casing allow hydraulic fluid to escape, leading to low pressure and overheating.
- Metallic grinding or whining noise from the gear train: Bearing fatigue or gear tooth spalling within the assembly produces audible distress, often accompanied by vibration through the chassis.
- Complete loss of forward or reverse drive: A seized planetary gearset or broken CYLINDRICAL PIN can halt all power transmission, requiring immediate unit replacement.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | 4657.056.051 |
| Assembly Type | Complete Powershift Transmission Unit |
| Dry Weight (approx.) | 385 kg (849 lbs) |
| Overall Length | 720 mm |
| Overall Width | 510 mm |
| Overall Height | 580 mm |
| Housing Material | High-strength cast iron (GGG-40) |
| OEM Reference | ZF 6 WG 210 |
| Bolt Torque (main housing) | 120 Nm (88.5 lb-ft) |
| Oil Capacity (system) | 28 liters (7.4 gallons) |
Compatibility
This complete unit is specifically designed for the ZF WG 210 series powershift transmissions. It is a direct fit for models including the WG180, WG200, and WG210. The assembly is commonly used in articulated dump trucks, wheel loaders, and telescopic handlers from OEMs such as Volvo, Liebherr, and Caterpillar. When replacing the unit, ensure the HOUSING REAR PART aligns with your machine’s PTO mounting flange. For partial rebuilds, verify that the internal clutch pack clearances match the 6-speed configuration of the 4657.056.051.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101039 | TRANSMISSION HOUSING | Main structural casing for gear and shaft support |
| 4657201028 | HOUS.FRONT SECT | Front section housing the input shaft and torque converter interface |
| 4657201013 | HOUSING REAR PART | Rear casing covering the output shaft and PTO drive |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for precise housing mating |
| 0636100801 | CAP SCREW | M12 fastener for housing bolt circle |
| 4656301148 | FIXING PLATE | Locking plate for clutch piston retention |
| 4657301034 | SCREEN SHEET | Fine mesh filter for oil sump pickup |
| 4657301035 | SCREEN SHEET | Coarse mesh pre-filter for hydraulic circuit |
| 0636100803 | CAP SCREW | M10 fastener for valve body mounting |
| 4681301040 | OIL FEED.HOUSG. | Pressurized oil distribution manifold to clutch packs |
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